[ARM] 3106/2: ARM EABI: some syscall adjustments

Patch from Nicolas Pitre

Fix a few syscalls for EABI requirements. They were sys_pread64 and
sys_pwrite64 where the last argument is now entirely pushed on stack,
but since commit 567bd980 they don't
require any fixup.  Remains only the stat64 structure. Non EABI kernels
are unaffected.

Signed-off-by: Nicolas Pitre
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>