serial: s5p: Add Apple M1 support

Apple M1 SoCs include an S5L UART which is a variant of the S5P
UART.  Add support for this variant and enable it by default
on Apple SoCs.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 122a397..7ee1290 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -290,7 +290,7 @@
 
 config DEBUG_UART_S5P
 	bool "Samsung S5P"
-	depends on ARCH_EXYNOS || ARCH_S5PC1XX
+	depends on ARCH_APPLE || ARCH_EXYNOS || ARCH_S5PC1XX
 	help
 	  Select this to enable a debug UART using the serial_s5p driver. You
 	  will need to provide parameters to make this work. The driver will
@@ -737,7 +737,7 @@
 
 config S5P_SERIAL
 	bool "Support for Samsung S5P UART"
-	depends on ARCH_EXYNOS || ARCH_S5PC1XX
+	depends on ARCH_APPLE || ARCH_EXYNOS || ARCH_S5PC1XX
 	default y
 	help
 	  Select this to enable Samsung S5P UART support.