omap: Fix incorrect 730 vs 850 detection

Commit cd922049

 added
support for omap850. However, the patch accidentally
removed the wrong ifdef:

 #  define cpu_is_omap730()		1
 # endif
 #endif
+#else
+# if defined(CONFIG_ARCH_OMAP850)
+#  undef  cpu_is_omap850
+#  define cpu_is_omap850()		1
+# endif
+#endif

...

 void omap2_check_revision(void);

 #endif    /* defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) */
-
-#endif

Instead of removing removing the #endif at the end of the file,
the #endif before #else should have been removed.

But we cannot have multiple #else statements as pointed out by
Alistair Buxton <a.j.buxton@gmail.com>. So the fix is to:

- remove the non-multi-omap special handling, as we need to
  detect between omap730 and omap850 anyways.

- add the missing #endif back to the end of the file

Reported-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>