Blackfin: workaround anomaly 05000481 (corruption with ITEST MMRs)

Nothing actually needs to use these MMRs (as direct cache manipulation
is done with the DTEST MMRs), so simply hide the read funcs behind the
anomaly define.  They're generally unusable anyways when this anomaly
is in effect.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/include/asm/cdef_LPBlackfin.h

@@ -172,16 +172,19 @@
 #define bfin_write_ICPLB_DATA14(val)         bfin_write32(ICPLB_DATA14,val)
 #define bfin_read_ICPLB_DATA15()             bfin_read32(ICPLB_DATA15)
 #define bfin_write_ICPLB_DATA15(val)         bfin_write32(ICPLB_DATA15,val)
-#define bfin_read_ITEST_COMMAND()            bfin_read32(ITEST_COMMAND)
 #define bfin_write_ITEST_COMMAND(val)        bfin_write32(ITEST_COMMAND,val)
 #if 0
 #define ITEST_INDEX            0xFFE01304   /* Instruction Test Index Register */
 #endif
-#define bfin_read_ITEST_DATA0()              bfin_read32(ITEST_DATA0)
 #define bfin_write_ITEST_DATA0(val)          bfin_write32(ITEST_DATA0,val)
-#define bfin_read_ITEST_DATA1()              bfin_read32(ITEST_DATA1)
 #define bfin_write_ITEST_DATA1(val)          bfin_write32(ITEST_DATA1,val)
 
+#if ANOMALY_05000481
+#define bfin_read_ITEST_COMMAND()            bfin_read32(ITEST_COMMAND)
+#define bfin_read_ITEST_DATA0()              bfin_read32(ITEST_DATA0)
+#define bfin_read_ITEST_DATA1()              bfin_read32(ITEST_DATA1)
+#endif
+
 /* Event/Interrupt Registers*/
 
 #define bfin_read_EVT0()                     bfin_read32(EVT0)