MIPS: Octeon: Determine if helper needs to be built

This patch adds an config switch to determine if we need to build some
workaround helper files.

The staging driver octeon-ethernet references some symbols which are only
built when PCI is enabled. The new config switch enables these symbols in
bothe cases.

Signed-off-by: Andreas Bießmann <[e-mail]>
To: [e-mail]
Cc: Andreas Bießmann <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/1543/
Acked-by: David Daney <[e-mail]>
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/cavium-octeon/Kconfig

···
 	def_bool y
 	select SPARSEMEM_STATIC
 	depends on CPU_CAVIUM_OCTEON
+
+config CAVIUM_OCTEON_HELPER
+	def_bool y
+	depends on OCTEON_ETHERNET || PCI

arch/mips/cavium-octeon/executive/Makefile

···
 
 obj-y += cvmx-bootmem.o cvmx-l2c.o cvmx-sysinfo.o octeon-model.o
 
-obj-$(CONFIG_PCI) += cvmx-helper-errata.o cvmx-helper-jtag.o
+obj-$(CONFIG_CAVIUM_OCTEON_HELPER) += cvmx-helper-errata.o cvmx-helper-jtag.o