rk3368: trust v0.7 support merge bl32.

1. trust merge bl32 depend on CONFIG_RK_TRUSTOS;
    2. trust_merger tool enable merge bl32;
    3. Makefile enable --subfix depend on CONFIG_RK_TRUSTOS;

RKTRUST/RK3368TRUST.ini

@@ -1,6 +1,6 @@
 [VERSION]
 MAJOR=0
-MINOR=6
+MINOR=7
 [BL30_OPTION]
 SEC=1
 PATH=tools/rk_tools/bin/rk33/rk3368bl30_v2.04.bin
@@ -11,6 +11,8 @@ PATH=tools/rk_tools/bin/rk33/rk3368bl31_v1.3.bin
 ADDR=0x00008000
 [BL32_OPTION]
 SEC=0
+PATH=tools/rk_tools/bin/rk33/rk3368bl32_v0.1.bin
+ADDR=0x08000000
 [BL33_OPTION]
 SEC=0
 [OUTPUT]