ARM: Drop unreferenced CONFIG_* defines named after SoCs

The following config symbols are only defined once and never referenced
anywhere else:

CONFIG_ARM926EJS
CONFIG_CPUAT91
CONFIG_EXYNOS5800
CONFIG_SYS_CORTEX_R4

Most of them are config symbols named after the respective SoCs which
seems to have been a standard practice at some point.
Signed-off-by: NTuomas Tynkkynen <tuomas@tuxera.com>

include/configs/at91rm9200ek.h

@@ -44,7 +44,6 @@
 /* CPU configuration */
 #define CONFIG_AT91RM9200
 #define CONFIG_AT91RM9200EK
-#define CONFIG_CPUAT91
 #define USE_920T_MMU
 
 #include <asm/hardware.h>	/* needed for port definitions */

include/configs/exynos5420-common.h

@@ -10,8 +10,6 @@
 #define __CONFIG_EXYNOS5420_H
 
 #define CONFIG_EXYNOS5420
-/* A variant of Exynos5420 (Exynos5 Family) */
-#define CONFIG_EXYNOS5800
 
 #define CONFIG_EXYNOS5_DT
 

include/configs/omapl138_lcdk.h

@@ -23,7 +23,6 @@
  * SoC Configuration
  */
 #define CONFIG_MACH_OMAPL138_LCDK
-#define CONFIG_ARM926EJS		/* arm926ejs CPU core */
 #define CONFIG_SYS_CLK_FREQ		clk_get(DAVINCI_ARM_CLKID)
 #define CONFIG_SYS_OSCIN_FREQ		24000000
 #define CONFIG_SYS_TIMERBASE		DAVINCI_TIMER0_BASE

include/configs/stv0991.h

@@ -10,8 +10,6 @@
 #define CONFIG_SYS_DCACHE_OFF
 #define CONFIG_SYS_EXCEPTION_VECTORS_HIGH
 
-#define CONFIG_SYS_CORTEX_R4
-
 /* ram memory-related information */
 #define CONFIG_NR_DRAM_BANKS			1
 #define PHYS_SDRAM_1				0x00000000

scripts/config_whitelist.txt

@@ -50,7 +50,6 @@ CONFIG_ARCH_USE_BUILTIN_BSWAP
 CONFIG_ARC_MMU_VER
 CONFIG_ARC_SERIAL
 CONFIG_ARIES_M28_V10
-CONFIG_ARM926EJS
 CONFIG_ARMADA100
 CONFIG_ARMADA100_FEC
 CONFIG_ARMADA168
@@ -272,7 +271,6 @@ CONFIG_CORTINA_FW_LENGTH
 CONFIG_CPLD_BR_PRELIM
 CONFIG_CPLD_OR_PRELIM
 CONFIG_CPM2
-CONFIG_CPUAT91
 CONFIG_CPU_ARCHS34
 CONFIG_CPU_ARMV8
 CONFIG_CPU_CAVIUM_OCTEON
@@ -598,7 +596,6 @@ CONFIG_EXYNOS4210
 CONFIG_EXYNOS5
 CONFIG_EXYNOS5250
 CONFIG_EXYNOS5420
-CONFIG_EXYNOS5800
 CONFIG_EXYNOS5_DT
 CONFIG_EXYNOS7420
 CONFIG_EXYNOS_ACE_SHA
@@ -2255,7 +2252,6 @@ CONFIG_SYS_CMXFCR_VALUE2
 CONFIG_SYS_CMXFCR_VALUE3
 CONFIG_SYS_CORE_SRAM
 CONFIG_SYS_CORE_SRAM_SIZE
-CONFIG_SYS_CORTEX_R4
 CONFIG_SYS_CORTINA_FW_IN_MMC
 CONFIG_SYS_CORTINA_FW_IN_NAND
 CONFIG_SYS_CORTINA_FW_IN_NOR