remoteproc/omap: remove the mbox_callback limitation
remoteproc/omap: remove the mbox_callback limitation

Now that remoteproc supports any number of virtio devices,
the previous sanity check in omap_rproc_mbox_callback
doesn't make sense anymore.

Remove that so we can start supporting multiple vdevs.

Signed-off-by: Ohad Ben-Cohen <f42ebdd520afb7505b40286b1d13fbb7281e5b96@wizery.com>
Cc: Brian Swetland <59621ccc00d6b5a4203fcb7bcc3be3d6b35f3ac0@google.com>
Cc: Iliyan Malchev <b9962a40c76f189681da2829a74a26cab77021ea@google.com>
Cc: Arnd Bergmann <f2c659f01951776204a6c5b902787d9019fbeebd@arndb.de>
Cc: Grant Likely <9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@secretlab.ca>
Cc: Rusty Russell <df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au>
Cc: Mark Grosen <626d0b6e003883ecfc89eb4c9c2ab324c1ff308c@ti.com>
Cc: John Williams <a8572cb80e874659613ad84b041240d805ae9760@petalogix.com>
Cc: Michal Simek <3a191dd2be46e826fee926d532b136ed65cb5318@monstr.eu>
Cc: Loic PALLARDY <c5fc3630e84ba083589c715116a290542c97f5bb@stericsson.com>
Cc: Ludovic BARRE <7d00b576244a20da2a0f3436a00218e40cced604@stericsson.com>
Cc: Omar Ramirez Luna <75108f4fedbbf960e2d357a652cba42b6b93f179@linaro.org>
Cc: Guzman Lugo Fernando <ce564f1db7746e165d007472e93c96c0f8f027cd@ti.com>
Cc: Anna Suman <68636d6b0a4dfe1213ee9d7712e75a8cc339119f@ti.com>
Cc: Clark Rob <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@ti.com>
Cc: Stephen Boyd <010521127f513270fe503d86ab8316ac5147f4b7@codeaurora.org>
Cc: Saravana Kannan <ce25c3cee4cc6c4c8acfc1680b3ed89cf644dba3@codeaurora.org>
Cc: David Brown <67bb63793f66c3c3797af10faa739beca3aeb927@codeaurora.org>
Cc: Kieran Bingham <bfe6cff12e801e27523042f7b88bcd645543cf82@gmail.com>
Cc: Tony Lindgren <1001e8702733cced254345e193c88aaa47a4f5de@atomide.com>

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