mpc83xx: Migrate SPCR to Kconfig

Migrate the SPCR setting to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/mpc8308_p1m_defconfig b/configs/mpc8308_p1m_defconfig
index f73084c..f1559be 100644
--- a/configs/mpc8308_p1m_defconfig
+++ b/configs/mpc8308_p1m_defconfig
@@ -70,6 +70,7 @@
 CONFIG_SICR_GPIOSEL_IEEE1588=y
 CONFIG_ACR_PIPE_DEP_4=y
 CONFIG_ACR_RPTCNT_4=y
+CONFIG_SPCR_TSECEP_3=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_BOOTDELAY=5