imx8mq_phanbell: Run SPL with caches enabled

It is safe to run SPL with caches enabled on i.MX8M, so
remove such restriction.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/configs/imx8mq_phanbell_defconfig b/configs/imx8mq_phanbell_defconfig
index d1e9cc4..651940c 100644
--- a/configs/imx8mq_phanbell_defconfig
+++ b/configs/imx8mq_phanbell_defconfig
@@ -1,6 +1,4 @@
 CONFIG_ARM=y
-CONFIG_SPL_SYS_ICACHE_OFF=y
-CONFIG_SPL_SYS_DCACHE_OFF=y
 CONFIG_ARCH_IMX8M=y
 CONFIG_SYS_TEXT_BASE=0x40200000
 CONFIG_SYS_MALLOC_F_LEN=0x4000