watchdog: designware: Make this depend on WDT

As this driver can dynamically determine the values set in
CONFIG_DW_WDT_BASE when using WDT, so make this depend on WDT rather
than migrate CONFIG_DW_WDT_BASE to Kconfig.

Cc: Chee Tien Fong <tien.fong.chee@intel.com>
Cc: Chin-Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinh.nguyen@intel.com>
Cc: Holger Brunck <holger.brunck@hitachienergy.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Siew Chin Lim <elly.siew.chin.lim@intel.com>
Cc: Stefan Roese <sr@denx.de>
Cc: hee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Stefan Roese <sr@denx.de>

include/configs/socfpga_common.h

@@ -66,7 +66,6 @@
 /*
  * L4 Watchdog
  */
-#define CONFIG_DW_WDT_BASE		SOCFPGA_L4WD0_ADDRESS
 #define CONFIG_DW_WDT_CLOCK_KHZ		25000
 
 /*

include/configs/socfpga_soc64_common.h

@@ -92,7 +92,6 @@
 /*
  * L4 Watchdog
  */
-#define CONFIG_DW_WDT_BASE		SOCFPGA_L4WD0_ADDRESS
 #ifdef CONFIG_TARGET_SOCFPGA_STRATIX10
 #ifndef __ASSEMBLY__
 unsigned int cm_get_l4_sys_free_clk_hz(void);