powerpc: Add __attribute_const__ to ffs()-family implementations

powerpc: Add __attribute_const__ to ffs()-family implementations

While tracking down a problem where constant expressions used by
BUILD_BUG_ON() suddenly stopped working[1], we found that an added static
initializer was convincing the compiler that it couldn't track the state
of the prior statically initialized value. Tracing this down found that
ffs() was used in the initializer macro, but since it wasn't marked with
__attribute__const__, the compiler had to assume the function might
change variable states as a side-effect (which is not true for ffs(),
which provides deterministic math results).

Add missing __attribute_const__ annotations to PowerPC's implementations of
fls() function. These are pure mathematical functions that always return
the same result for the same input with no side effects, making them eligible
for compiler optimization.

Build tested ARCH=powerpc defconfig with GCC powerpc-linux-gnu 14.2.0.

Link: https://github.com/KSPP/linux/issues/364
Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250804164417.1612371-5-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>