[nrf fromlist] zephyr: Remove BOOT_SERIAL_UART dependency from ENABLE_MGMT_PERUSER

The dependency, in Kconfig,  blocked usage of the ENABLE_MGMT_PERUSER
with other BOOT_SERIAL_ device options.

Upstream PR: mcu-tools/mcuboot#1125

Signed-off-by: Dominik Ermel <[email protected]>
(cherry picked from commit 4a5325a)

Author: de-nordic

boot/zephyr/Kconfig

@@ -555,7 +555,6 @@ config BOOT_ERASE_PROGRESSIVELY
 
 menuconfig ENABLE_MGMT_PERUSER
 	bool "Enable system specific mcumgr commands"
-	depends on BOOT_SERIAL_UART
 	help
 	  The option enables processing of system specific mcumgr commands;
 	  system specific commands are within group MGMT_GROUP_ID_PERUSER (64)