am335x_evm.h: Add back the actual load of the kernel image

Somewhere along the line of refactoring the am335x header files, the
kernel image load was lost, so put it back in.
Signed-off-by: NRobert P. J. Day <rpjday@crashcourse.ca>

include/configs/am335x_evm.h

@@ -132,7 +132,9 @@
 				"echo Running uenvcmd ...;" \
 				"run uenvcmd;" \
 			"fi;" \
-			"run mmcloados;" \
+			"if run loaduimage; then " \
+				"run mmcloados;" \
+			"fi;" \
 		"fi;\0" \
 	"spiboot=echo Booting from spi ...; " \
 		"run spiargs; " \