mariadb: use ${PN} for SYSTEMD_AUTO_ENABLE
mariadb: use ${PN} for SYSTEMD_AUTO_ENABLE

Use ${PN} instead of hardcoding 'mariadb' so that everything works
fine in case of multilib.

Signed-off-by: Chen Qi <633505cc1c1ae5749a9636f0ba75c172681d2e11@windriver.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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