mpc83xx: Migrate SPCR to Kconfig

Migrate the SPCR setting to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/strider_con_defconfig b/configs/strider_con_defconfig
index 722f25d..b11a26c 100644
--- a/configs/strider_con_defconfig
+++ b/configs/strider_con_defconfig
@@ -68,6 +68,7 @@
 CONFIG_SICR_TMSOBI2_2_5_V=y
 CONFIG_ACR_PIPE_DEP_4=y
 CONFIG_ACR_RPTCNT_4=y
+CONFIG_SPCR_TSECEP_3=y
 CONFIG_CMD_IOLOOP=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y