mx28: Fix typo in POWER_MINPWR_VBG_OFF

The POWER_MINPWR_VBG_OFF bit in mx28 power supply block is not called
POWER_MINPWR_FBG_OFF, but POWER_MINPWR_VBG_OFF. Correct the name in the
header file.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/include/asm/arch-mxs/regs-power.h b/arch/arm/include/asm/arch-mxs/regs-power.h
index a46a372..3c98cce 100644
--- a/arch/arm/include/asm/arch-mxs/regs-power.h
+++ b/arch/arm/include/asm/arch-mxs/regs-power.h
@@ -128,7 +128,7 @@
 #define	POWER_MINPWR_PWD_ANA_CMPS			(1 << 10)
 #define	POWER_MINPWR_ENABLE_OSC				(1 << 9)
 #define	POWER_MINPWR_SELECT_OSC				(1 << 8)
-#define	POWER_MINPWR_FBG_OFF				(1 << 7)
+#define	POWER_MINPWR_VBG_OFF				(1 << 7)
 #define	POWER_MINPWR_DOUBLE_FETS			(1 << 6)
 #define	POWER_MINPWR_HALFFETS				(1 << 5)
 #define	POWER_MINPWR_LESSANA_I				(1 << 4)