ARM: dra7: hwmod: Register dra76x specific hwmod

Certain IPs are available on dra76 which are not present
either in dra74 or dra72. So add provision to register dra76
specific IPs separately.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>