configs: Remove dead CONFIG options

BOOTP_DEFAULT is defined in several boards, but this config
option is never checked or used.

This patch removes this config option from config files and
the whitelist.txt
Signed-off-by: NAdam Ford <aford173@gmail.com>

include/configs/am335x_shc.h

@@ -239,7 +239,6 @@
 #undef CONFIG_TIMER
 #endif
 
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_NET_RETRY_COUNT         10
 
 /* I2C configuration */

include/configs/am3517_evm.h

@@ -32,7 +32,6 @@
 /* I2C */
 
 /* Ethernet */
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_NET_RETRY_COUNT		10
 
 /* Board NAND Info. */

include/configs/am43xx_evm.h

@@ -192,7 +192,6 @@
 
 #ifndef CONFIG_SPL_BUILD
 /* CPSW Ethernet */
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_NET_RETRY_COUNT		10
 #endif
 

include/configs/cm_t43.h

@@ -43,7 +43,6 @@
 					 50, 51, 52, 53, 54, 55, 56, 57, }
 
 /* CPSW Ethernet support */
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_SYS_RX_ETH_BUFFER	64
 
 /* USB support */

include/configs/omapl138_lcdk.h

@@ -152,7 +152,6 @@
  * Network & Ethernet Configuration
  */
 #ifdef CONFIG_DRIVER_TI_EMAC
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_NET_RETRY_COUNT	10
 #endif
 

include/configs/siemens-am33x-common.h

@@ -162,7 +162,6 @@
  * 0x442000 - 0x800000 : Userland
  */
 
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_NET_RETRY_COUNT         10
 
 /* NAND support */

include/configs/ti_armv7_keystone2.h

@@ -66,7 +66,6 @@
 #define CONFIG_SYS_SPI_CLK		ks_clk_get_rate(KS2_CLK1_6)
 
 /* Network Configuration */
-#define CONFIG_BOOTP_DEFAULT
 #define CONFIG_NET_RETRY_COUNT		32
 #define CONFIG_SYS_SGMII_REFCLK_MHZ	312
 #define CONFIG_SYS_SGMII_LINERATE_MHZ	1250

scripts/config_whitelist.txt

@@ -123,7 +123,6 @@ CONFIG_BOOTMODE
 CONFIG_BOOTP_
 CONFIG_BOOTP_BOOTFILE
 CONFIG_BOOTP_BOOTFILESIZE
-CONFIG_BOOTP_DEFAULT
 CONFIG_BOOTP_DHCP_REQUEST_DELAY
 CONFIG_BOOTP_ID_CACHE_SIZE
 CONFIG_BOOTP_MAY_FAIL