misc/pvpanic: resolve compile errors for arch=um

Resolve compile error for arch=um
pvpanic.c:(.text+0xb6): undefined reference to `devm_ioremap_resource'

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>