powerpc: Fix build break due to missing PPC_FEATURE2_HTM_NOSC

The backport of 4705e024 ("powerpc: Update TM user feature bits in
scan_features()") (f49eb503), missed the fact that 4.1 doesn't
include the commit that added PPC_FEATURE2_HTM_NOSC.

The correct fix is simply to omit PPC_FEATURE2_HTM_NOSC.

Fixes: f49eb503 ("powerpc: Update TM user feature bits in scan_features()")
Reported-by: Christian Zigotzky <chzigotzky@bayern-mail.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>