kernel: sem: Modify the way BUILD_ASSERT is used

BUILD_ASSERT() macro makes use of __COUNTER__ which may not be
supported in some compilers (like xcc). So, multiple uses of
BUILD_ASSERT() in same scope is not possible for such compilers.
Instead, the expression to BUILD_ASSERT can be "&&"ed to achieve
the same purpose.

Signed-off-by: Rajavardhan Gundi <rajavardhan.gundi@intel.com>