x86: msr-index.h: fix shifts to ULL results in HWP macros.

x = 1
ulong_long = x << 32;

results in:

warning: left shift count >= width of type

x = 8
ulong_long = x << 24;

results in a sign extended ulong_long

Cast x to unsigned long long in these macros
to prevent these errors.

Signed-off-by: Len Brown <len.brown@intel.com>