usb: dwc3: drop HAVE_CLK dependency from Exynos glue layer

commit 93abe8e4 (clk: add non CONFIG_HAVE_CLK routines)
added clk API stubs when !defined(CONFIG_HAVE_CLK).

This allows us to remove the HAVE_CLK dependency from
Exynos' glue layer and let it compile always.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/Makefile

@@ -27,19 +27,7 @@ endif
 ##
 
 obj-$(CONFIG_USB_DWC3)		+= dwc3-omap.o
-
-##
-# REVISIT Samsung Exynos platform needs the clk API which isn't
-# defined on all architectures. If we allow dwc3-exynos.c compile
-# always we will fail the linking phase on those architectures
-# which don't provide clk api implementation and that's unnaceptable.
-#
-# When Samsung's platform start supporting pm_runtime, this check
-# for HAVE_CLK should be removed.
-##
-ifneq ($(CONFIG_HAVE_CLK),)
-	obj-$(CONFIG_USB_DWC3)		+= dwc3-exynos.o
-endif
+obj-$(CONFIG_USB_DWC3)		+= dwc3-exynos.o
 
 ifneq ($(CONFIG_PCI),)
 	obj-$(CONFIG_USB_DWC3)		+= dwc3-pci.o