GPIO: pca953x: Rework to not include commands in SPL

The command portion of the GPIO driver can only be used in full SPL so
re-work to guard the command related portions and mark it as static.

Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/gpio/pca953x.c

@@ -142,7 +142,7 @@ int pca953x_get_val(uint8_t chip)
 	return (int)val;
 }
 
-#ifdef CONFIG_CMD_PCA953X
+#if defined(CONFIG_CMD_PCA953X) && !defined(CONFIG_SPL_BUILD)
 /*
  * Display pca953x information
  */
@@ -193,7 +193,7 @@ static int pca953x_info(uint8_t chip)
 	return 0;
 }
 
-cmd_tbl_t cmd_pca953x[] = {
+static cmd_tbl_t cmd_pca953x[] = {
 	U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
 	U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
 	U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
@@ -201,7 +201,7 @@ cmd_tbl_t cmd_pca953x[] = {
 	U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
 };
 
-int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
 	int ret = CMD_RET_USAGE, val;