rockchip: sysreset: update Makefile to work with merged sysreset driver

After applying the merged sysreset driver, there are build failures
due to an out-of-sync Makefile. This updates drivers/sysreset/Makefile
to address these build failures.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/sysreset/Makefile

@@ -9,16 +9,7 @@ obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
 
-ifndef CONFIG_SPL_BUILD
-obj-$(CONFIG_ROCKCHIP_RK3036) += sysreset_rk3036.o
-endif
-obj-$(CONFIG_ROCKCHIP_RK3188) += sysreset_rk3188.o
-obj-$(CONFIG_ROCKCHIP_RK322X) += sysreset_rk322x.o
-obj-$(CONFIG_ROCKCHIP_RK3288) += sysreset_rk3288.o
-obj-$(CONFIG_ROCKCHIP_RK3328) += sysreset_rk3328.o
-obj-$(CONFIG_ROCKCHIP_RK3368) += sysreset_rk3368.o
-obj-$(CONFIG_ROCKCHIP_RK3399) += sysreset_rk3399.o
-obj-$(CONFIG_ROCKCHIP_RV1108) += sysreset_rv1108.o
+obj-$(CONFIG_ARCH_ROCKCHIP) += sysreset_rockchip.o
 obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o
 obj-$(CONFIG_ARCH_SNAPDRAGON) += sysreset_snapdragon.o
 obj-$(CONFIG_ARCH_STI) += sysreset_sti.o