firmware: fix a spelling mistake "managament" -> "management" in Kconfig

There is a spelling mistake in the Kconfig help text. Fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201204192250.1151316-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Colin Ian King

drivers/firmware/Kconfig

@@ -51,7 +51,7 @@ config ARM_SCPI_PROTOCOL
 	  provides a mechanism for inter-processor communication between SCP
 	  and AP.
 
-	  SCP controls most of the power managament on the Application
+	  SCP controls most of the power management on the Application
 	  Processors. It offers control and management of: the core/cluster
 	  power states, various power domain DVFS including the core/cluster,
 	  certain system clocks configuration, thermal sensors and many