[libata] Introduce ata_id_has_unload()
[libata] Introduce ata_id_has_unload()

Add a function to check an ATA device's id for head unload support as
specified in ATA-7.

Signed-off-by: Elias Oltmanns <f4c975cbf19a2f6bc99185e7104594eb2d1a3102@nebensachen.de>
Signed-off-by: Jeff Garzik <15f615bf7d20c2937c7eb5aa759110fd6768848c@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs