cpufreq: loongson1: Add missing MODULE_ALIAS

cpufreq: loongson1: Add missing MODULE_ALIAS

BugLink: https://bugs.launchpad.net/bugs/1910111
[ Upstream commit b9acab091842ca8b288882798bb809f7abf5408a ]

This patch adds missing MODULE_ALIAS for automatic loading of this cpufreq
driver when it is compiled as an external module.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: a0a22cf14472f ("cpufreq: Loongson1: Add cpufreq driver for Loongson1B")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>