kconfig: remove meaningless prefixes in defconfig files

Since commit e02ee2548afe (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>
diff --git a/configs/A10s-OLinuXino-M_defconfig b/configs/A10s-OLinuXino-M_defconfig
index b5f0a0f..73b7894 100644
--- a/configs/A10s-OLinuXino-M_defconfig
+++ b/configs/A10s-OLinuXino-M_defconfig
@@ -3,11 +3,11 @@
 CONFIG_FDTFILE="sun5i-a10s-olinuxino-micro.dtb"
 CONFIG_MMC_SUNXI_SLOT_EXTRA=1
 CONFIG_USB1_VBUS_PIN="PB10"
-+S:CONFIG_MMC0_CD_PIN="PG1"
-+S:CONFIG_MMC1_CD_PIN="PG13"
-+S:CONFIG_ARM=y
-+S:CONFIG_ARCH_SUNXI=y
-+S:CONFIG_MACH_SUN5I=y
-+S:CONFIG_DRAM_CLK=432
-+S:CONFIG_DRAM_ZQ=123
-+S:CONFIG_DRAM_EMR1=4
+CONFIG_MMC0_CD_PIN="PG1"
+CONFIG_MMC1_CD_PIN="PG13"
+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_MACH_SUN5I=y
+CONFIG_DRAM_CLK=432
+CONFIG_DRAM_ZQ=123
+CONFIG_DRAM_EMR1=4