am65x_evm: Allow bootm to load larger kernels

Bootm will fail to load kernels over 8MB, this is not enough
for our 64bit kernel images. Increase this to 64MB.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/include/configs/am65x_evm.h b/include/configs/am65x_evm.h
index 31749c6..9ce5b6e 100644
--- a/include/configs/am65x_evm.h
+++ b/include/configs/am65x_evm.h
@@ -37,6 +37,8 @@
 #define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SPL_TEXT_BASE +	\
 					CONFIG_SYS_K3_NON_SECURE_MSRAM_SIZE - 4)
 
+#define CONFIG_SYS_BOOTM_LEN		SZ_64M
+
 /* U-Boot general configuration */
 #define EXTRA_ENV_AM65X_BOARD_SETTINGS					\
 	"findfdt="							\