anv: Put MOCS in the correct location

My patch to switch from struct-based MOCS to numeric MOCS accidentally
divided all MOCS entries by 2 in the Vulkan driver.

MOCS on Gen9+ is just an array index into a table.  But in the hardware
packets, the index starts at bit 1.  So we need to shift it.

Fixes: 0b44644c (genxml: Consistently use a numeric "MOCS" field)
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