samples: suit: smp_transfer: flash_companion: disable CLOCK_CONTROL

CLOCK_CONTROL is now enabled by default for the nRF54H20 cpuapp.
Disable it for the flash_companion to save flash.

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>

samples/suit/flash_companion/prj.conf

@@ -72,3 +72,6 @@ CONFIG_ZCBOR_CANONICAL=y
 # Enable LTO
 CONFIG_LTO=y
 CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
+
+# Minimize flash usage
+CONFIG_CLOCK_CONTROL=n