env: Fix missed getenv_ulong to env_get_ulong conversion

This seems to have been missed, possibly due to the inability to
enable TI_SECURE_DEVICE on Keystone2 devices previously.

Fixes: bfebc8c965e4 ("env: Rename getenv_hex(), getenv_yesno(), getenv_ulong()")
Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

board/ti/ks2_evm/board_k2g.c

@@ -376,7 +376,7 @@ int get_num_eth_ports(void)
 #ifdef CONFIG_TI_SECURE_DEVICE
 void board_pmmc_image_process(ulong pmmc_image, size_t pmmc_size)
 {
-	int id = getenv_ulong("dev_pmmc", 10, 0);
+	int id = env_get_ulong("dev_pmmc", 10, 0);
 	int ret;
 
 	if (!rproc_is_initialized())