ARM: mxs: Enable DCDC converter for battery boot

In case the board detected sufficient voltage for battery boot,
make sure the DCDC converter is ON and the board is not running
only from linregs, otherwise an instability will be observed.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>

arch/arm/cpu/arm926ejs/mxs/spl_power_init.c

@@ -654,6 +654,8 @@ static void mxs_batt_boot(void)
 	clrsetbits_le32(&power_regs->hw_power_5vctrl,
 		POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
 		0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
+
+	mxs_power_enable_4p2();
 }
 
 /**