x86: uv_bau.h: fix dubious bitfield

Impact: cleanup, avoid sparse warnings

declare bitfield as unsigned to avoid dubious bitfield issue

 CHECK   arch/x86/kernel/tlb_64.c
arch/x86/include/asm/uv/uv_bau.h:136:22: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:138:25: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:140:15: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:143:14: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:146:14: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:149:18: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:151:18: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:155:14: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:159:18: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:173:19: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:181:16: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:185:18: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:188:16: error: dubious one-bit signed bitfield

 CHECK   arch/x86/kernel/tlb_uv.c
arch/x86/include/asm/uv/uv_bau.h:136:22: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:138:25: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:140:15: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:143:14: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:146:14: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:149:18: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:151:18: warning: dubious bitfield without explicit `signed' or `unsigned'
arch/x86/include/asm/uv/uv_bau.h:155:14: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:159:18: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:173:19: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:181:16: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:185:18: error: dubious one-bit signed bitfield
arch/x86/include/asm/uv/uv_bau.h:188:16: error: dubious one-bit signed bitfield

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>