clocksource/drivers/u300: Remove the u300 driver

The ST-Ericsson U300 platform is getting removed, so this driver is no
longer needed.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210120131559.1971359-2-arnd@kernel.org

Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt

-ST-Ericsson U300 apptimer
-
-Required properties:
-
-- compatible : should be "stericsson,u300-apptimer"
-- reg : Specifies base physical address and size of the registers.
-- interrupts : A list of 4 interrupts; one for each subtimer. These
-  are, in order: OS (operating system), DD (device driver) both
-  adopted for EPOC/Symbian with two specific IRQs for these tasks,
-  then GP1 and GP2, which are general-purpose timers.
-
-Example:
-
-timer {
-	compatible = "stericsson,u300-apptimer";
-	reg = <0xc0014000 0x1000>;
-	interrupts = <24 25 26 27>;
-};

drivers/clocksource/Kconfig

@@ -216,13 +216,6 @@ config PRIMA2_TIMER
 	help
 	  Enables support for the Prima2 timer.
 
-config U300_TIMER
-	bool "U300 timer driver" if COMPILE_TEST
-	depends on ARM
-	select CLKSRC_MMIO
-	help
-	  Enables support for the U300 timer.
-
 config NSPIRE_TIMER
 	bool "NSpire timer driver" if COMPILE_TEST
 	select CLKSRC_MMIO

drivers/clocksource/Makefile

@@ -34,7 +34,6 @@ obj-$(CONFIG_ATLAS7_TIMER)	+= timer-atlas7.o
 obj-$(CONFIG_MXS_TIMER)		+= mxs_timer.o
 obj-$(CONFIG_CLKSRC_PXA)	+= timer-pxa.o
 obj-$(CONFIG_PRIMA2_TIMER)	+= timer-prima2.o
-obj-$(CONFIG_U300_TIMER)	+= timer-u300.o
 obj-$(CONFIG_SUN4I_TIMER)	+= timer-sun4i.o
 obj-$(CONFIG_SUN5I_HSTIMER)	+= timer-sun5i.o
 obj-$(CONFIG_MESON6_TIMER)	+= timer-meson6.o