imx: imx7d: remove CamelCase from ENET_xMHz macros

Update these macros to use all upper-case to avoid checkpatch
warnings:

	ENET_25MHz,
	ENET_50MHz,
	ENET_125MHz,

Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mx7/clock.h

@@ -318,9 +318,9 @@ struct clk_root_map {
 };
 
 enum enet_freq {
-	ENET_25MHz,
-	ENET_50MHz,
-	ENET_125MHz,
+	ENET_25MHZ,
+	ENET_50MHZ,
+	ENET_125MHZ,
 };
 
 u32 get_root_clk(enum clk_root_index clock_id);