board: phytec: phycore_am64x: Use k3_mmc.env logic

Use our common environment file to implement MMC boot.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
diff --git a/board/phytec/phycore_am64x/phycore_am64x.env b/board/phytec/phycore_am64x/phycore_am64x.env
index e24a958..18f0fa5 100644
--- a/board/phytec/phycore_am64x/phycore_am64x.env
+++ b/board/phytec/phycore_am64x/phycore_am64x.env
@@ -1,3 +1,5 @@
+#include <env/phytec/k3_mmc.env>
+
 fdtaddr=0x88000000
 loadaddr=0x82000000
 scriptaddr=0x80000000
@@ -12,13 +14,3 @@
 mmcpart=1
 console=ttyS2,115200n8
 earlycon=ns16550a,mmio32,0x02800000
-mmcargs=setenv bootargs console=${console} earlycon=${earlycon}
-	root=/dev/mmcblk${mmcdev}p${mmcroot} rootwait rw
-loadimage=load mmc ${mmcdev}:${mmcpart} ${loadaddr} Image
-loadfdt=load mmc ${mmcdev}:${mmcpart} ${fdtaddr} ${fdtfile}
-mmcboot=run mmcargs;
-	mmc dev ${mmcdev};
-	mmc rescan;
-	run loadimage;
-	run loadfdt;
-	booti ${loadaddr} - ${fdtaddr}