Revert "ns16650: Make sure we have CONFIG_CLK set before using infrastructure"

This reverts commit 82f5279b0cd99a9163d34cfe926d0316d9dc0d37.

The build failure of k2*evm boards was fixed in a different way by
the previous commit.  It is nasty to patch generic drivers around
with #ifdef CONFIG_CLK just for the KeyStone's matter.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 29d5471..6e9b946 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -13,7 +13,6 @@
 #include <serial.h>
 #include <watchdog.h>
 #include <linux/types.h>
-#include <linux/compiler.h>
 #include <asm/io.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -354,8 +353,8 @@
 {
 	struct ns16550_platdata *plat = dev->platdata;
 	fdt_addr_t addr;
-	__maybe_unused struct clk clk;
-	__maybe_unused int err;
+	struct clk clk;
+	int err;
 
 	/* try Processor Local Bus device first */
 	addr = dev_get_addr(dev);
@@ -402,7 +401,6 @@
 	plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
 					 "reg-shift", 0);
 
-#ifdef CONFIG_CLK
 	err = clk_get_by_index(dev, 0, &clk);
 	if (!err) {
 		err = clk_get_rate(&clk);
@@ -412,7 +410,6 @@
 		debug("ns16550 failed to get clock\n");
 		return err;
 	}
-#endif
 
 	if (!plat->clock)
 		plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset,