kconfig: remove meaningless prefixes in defconfig files

Since commit e02ee2548a (kconfig: switch to single .config
configuration), the prefixes in defconfig files such as "+S:",
"+ST:", etc., are meaningless.

This commit was generated by the following command:

  find configs -name '*_defconfig' | xargs sed -i 's/^+*S*T*://'

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

configs/sunxi_Gemei_G9_defconfig

@@ -12,9 +12,9 @@ CONFIG_VIDEO_LCD_PANEL_LVDS=y
 CONFIG_VIDEO_LCD_POWER="PH8"
 CONFIG_VIDEO_LCD_BL_EN="PH7"
 CONFIG_VIDEO_LCD_BL_PWM="PB2"
-+S:CONFIG_ARM=y
-+S:CONFIG_ARCH_SUNXI=y
-+S:CONFIG_MACH_SUN4I=y
-+S:CONFIG_DRAM_CLK=432
-+S:CONFIG_DRAM_ZQ=123
-+S:CONFIG_DRAM_EMR1=4
+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_MACH_SUN4I=y
+CONFIG_DRAM_CLK=432
+CONFIG_DRAM_ZQ=123
+CONFIG_DRAM_EMR1=4