In the inline function cfi_build_cmd_addr, the cast of cmd_ofs to an
uint8_t produces a sparse warning of the type:

warning: cast truncates bits from constant value (2aa becomes aa)

Quiet the warning by masking cmd_ofs with 0xff and remove the cast.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>