samples: tfm: tfm_psa_template: Remove old sysbuild options

These options are now automatically generated, they are no longer
needed

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

samples/tfm/tfm_psa_template/sysbuild.conf

@@ -8,6 +8,5 @@ SB_CONFIG_BOOTLOADER_MCUBOOT=y
 SB_CONFIG_SECURE_BOOT_APPCORE=y
 SB_CONFIG_BOOT_SIGNATURE_TYPE_ECDSA_P256=y
 SB_CONFIG_MCUBOOT_MODE_OVERWRITE_ONLY=y
-SB_CONFIG_MCUBOOT_UPDATEABLE_IMAGES=2
 SB_CONFIG_APPROTECT_LOCK=y
 SB_CONFIG_SECURE_APPROTECT_LOCK=y