soc: kunpeng_hccs: add MAILBOX dependency

mainline inclusion
from mainline-v6.6-rc1
commit a90d34af
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I81QY0
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.6-rc1&id=a90d34afee25e8e2753859b2e00d83f6b9bf410a



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When the mailbox subsystem is disabled, the driver fails to link, so add
an explicit dependency. Some other drivers use 'select' here, but the
dependency seems more logical and more common.

Fixes: 886bdf9c ("soc: hisilicon: Support HCCS driver on Kunpeng SoC")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>