arm: mach-k3: Fix nomenclature on Silicon Revisions

Data manual mentions the new silicon revisions as SR instead of PG. Use
the same nomenclature inside U-Boot as well.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index 2f82edb..7af60a7 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -218,7 +218,7 @@
 		name = "Unknown Silicon";
 	};
 
-	printf("%s PG ", name);
+	printf("%s SR ", name);
 	switch (rev) {
 	case REV_PG1_0:
 		name = "1.0";