Revert "hwrng: mpfs - Enable COMPILE_TEST"

This reverts commit 6a71277c.

The underlying option POLARFIRE_SOC_SYS_CTRL already supports
COMPILE_TEST so there is no need for this.  What's more, if
we force this option on without the underlying option it fails
to build.
Reported-by: Nkernel test robot <lkp@intel.com>
Reported-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/Kconfig

@@ -387,7 +387,7 @@ config HW_RANDOM_PIC32
 
 config HW_RANDOM_POLARFIRE_SOC
 	tristate "Microchip PolarFire SoC Random Number Generator support"
-	depends on POLARFIRE_SOC_SYS_CTRL || COMPILE_TEST
+	depends on HW_RANDOM && POLARFIRE_SOC_SYS_CTRL
 	help
 	  This driver provides kernel-side support for the Random Number
 	  Generator hardware found on PolarFire SoC (MPFS).