hevc: Fix typos of NAL_BLA_N_LP for NAL_BLA_W_RADL.

Conflicts:
	libavcodec/hevc.c
hevc: Use av_ceil_log2_c() to get number of bits of short_term_ref_pic_set_idx.
Revert "hevc: Use av_ceil_log2_c() to get number of bits of short_term_ref_pic_set_idx."

This reverts commit 336d6accefaa9daeb2077c126fd1cc896810935d.
Revert "hevc: Fix typos of NAL_BLA_N_LP for NAL_BLA_W_RADL."

This reverts commit cb166897b924754145f9d74f4dd44b14ea5ba173.