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/CSQ_CS908_defconfig b/configs/CSQ_CS908_defconfig
index 4040bee..ec84acb 100644
--- a/configs/CSQ_CS908_defconfig
+++ b/configs/CSQ_CS908_defconfig
@@ -1,15 +1,15 @@
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="USB_EHCI,SUNXI_GMAC"
 CONFIG_FDTFILE="sun6i-a31s-cs908.dtb"
-+S:CONFIG_ARM=y
-+S:CONFIG_ARCH_SUNXI=y
-+S:CONFIG_MACH_SUN6I=y
-+S:CONFIG_DRAM_CLK=432
-+S:CONFIG_DRAM_ZQ=123
+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_MACH_SUN6I=y
+CONFIG_DRAM_CLK=432
+CONFIG_DRAM_ZQ=123
 # Ethernet phy power
-+S:CONFIG_AXP221_DLDO1_VOLT=3300
+CONFIG_AXP221_DLDO1_VOLT=3300
 # Wifi power
-+S:CONFIG_AXP221_ALDO1_VOLT=3300
+CONFIG_AXP221_ALDO1_VOLT=3300
 # No Vbus gpio for either usb
-+S:CONFIG_USB1_VBUS_PIN=""
-+S:CONFIG_USB2_VBUS_PIN=""
+CONFIG_USB1_VBUS_PIN=""
+CONFIG_USB2_VBUS_PIN=""