imx: enable necessary errata for i.mx8qm

NXP's i.MX8QM uses Cortex-A53 r0p4, enable necessary
erratas for it.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

plat/imx/imx8qm/platform.mk

@@ -38,3 +38,7 @@ RESET_TO_BL31		:=	1
 A53_DISABLE_NON_TEMPORAL_HINT := 0
 MULTI_CONSOLE_API	:=	1
 ERRATA_A72_859971	:=	1
+
+ERRATA_A53_835769	:=	1
+ERRATA_A53_843419	:=	1
+ERRATA_A53_855873	:=	1