Allow CDF precision to be configured with CDF_PROB_BITS.
This does not change the precision used for od_ec_enc_bool_q15 (used by aom_write and aom_write_bit), which means these two paths will use different CDF precision for now. The test that verifies that q15's code identically to CDFs is disabled. Change-Id: I4cd40a60d472eb58f37ac4fda1056b5dfe8b39a5
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