global: Migrate CONFIG_SYS_FSL* symbols to the CFG_SYS namespace

Migrate all of COFIG_SYS_FSL* to the CFG_SYS namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/kontron/pitx_imx8m/spl.c b/board/kontron/pitx_imx8m/spl.c
index ef32568..f6fd170 100644
--- a/board/kontron/pitx_imx8m/spl.c
+++ b/board/kontron/pitx_imx8m/spl.c
@@ -132,7 +132,7 @@
 	 * mmc0                    USDHC1
 	 * mmc1                    USDHC2
 	 */
-	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
+	for (i = 0; i < CFG_SYS_FSL_USDHC_NUM; i++) {
 		switch (i) {
 		case 0:
 			init_clk_usdhc(0);