px30: bl32: update version to v1.15

Build from optee commit in develop-next branch:
    82765277 rk3326 & rk3308: otp: fixed addr error in rk_otp_ns_buf_read

Update feature:
    60116db2 console_init: close serial only rely on t->u.serial.enable
    0b0a7989 drivers: rockchip: fix compile error on rk1808 and rk3308

Change-Id: Ia887c4578e052a6a22fa85fe24e39906559deff0
Signed-off-by: Hisping Lin <hisping.lin@rock-chips.com>

RKTRUST/PX30TRUST.ini

@@ -9,7 +9,7 @@ PATH=bin/rk33/px30_bl31_v1.21.elf
 ADDR=0x00040000
 [BL32_OPTION]
 SEC=1
-PATH=bin/rk33/px30_bl32_v1.14.bin
+PATH=bin/rk33/px30_bl32_v1.15.bin
 ADDR=0x08400000
 [BL33_OPTION]
 SEC=0