openpic: convert simple reg operations to builtin bitops
The openpic code has its own bitmap code to access bits inside of a
bitmap. However, that is overkill when we simply want to check for a
bit inside of a uint32_t.
So instead, let's use normal bit masks and C builtin shifts and ands.
Signed-off-by: NAlexander Graf <agraf@suse.de>
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