i915: make array flex_regs static const

Don't populate the read-only array flex_regs on the stack but
instead it static const. Also makes the object code a little smaller.
Signed-off-by: NColin Ian King <colin.i.king@gmail.com>
Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220112223435.949071-1-colin.i.king@gmail.com

drivers/gpu/drm/i915/i915_perf.c

@@ -2114,7 +2114,7 @@ gen8_update_reg_state_unlocked(const struct intel_context *ce,
 	u32 ctx_oactxctrl = stream->perf->ctx_oactxctrl_offset;
 	u32 ctx_flexeu0 = stream->perf->ctx_flexeu0_offset;
 	/* The MMIO offsets for Flex EU registers aren't contiguous */
-	i915_reg_t flex_regs[] = {
+	static const i915_reg_t flex_regs[] = {
 		EU_PERF_CNTL0,
 		EU_PERF_CNTL1,
 		EU_PERF_CNTL2,