vc4: rename file to group vpm optimizations together

This file will contain optimization passes for both vpm reads
and writes.

Signed-off-by: Varad Gautam <varadgautam@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/gallium/drivers/vc4/Makefile.sources

@@ -28,7 +28,7 @@ C_SOURCES := \
 	vc4_opt_cse.c \
 	vc4_opt_dead_code.c \
 	vc4_opt_small_immediates.c \
-	vc4_opt_vpm_writes.c \
+	vc4_opt_vpm.c \
 	vc4_program.c \
 	vc4_qir.c \
 	vc4_qir_lower_uniforms.c \

src/gallium/drivers/vc4/vc4_opt_vpm.c

@@ -22,7 +22,7 @@
  */
 
 /**
- * @file vc4_opt_vpm_writes.c
+ * @file vc4_opt_vpm.c
  *
  * This modifies instructions that generate the value consumed by a VPM write
  * to write directly into the VPM.