kernel: Use new symbol to deactivate MIPS FPU support

With kernel 5.4 the upstream kernel supports deactivating the FPU
support on MIPS. Use this new upstream feature instead of our older
patch which was removed when porting the kernel patches to kernel 5.4.

This way both options are set which should work for older kernel
versions and also new ones.

Signed-off-by: Hauke Mehrtens <[email protected]>

config/Config-kernel.in

@@ -44,11 +44,16 @@ config KERNEL_DEBUG_FS
 	  write to these files. Many common debugging facilities, such as
 	  ftrace, require the existence of debugfs.
 
+# remove KERNEL_MIPS_FPU_EMULATOR after kernel 4.14 and 4.14 are gone
 config KERNEL_MIPS_FPU_EMULATOR
 	bool "Compile the kernel with MIPS FPU Emulator"
 	default y if TARGET_pistachio
 	depends on (mips || mipsel || mips64 || mips64el)
 
+config KERNEL_MIPS_FP_SUPPORT
+	bool
+	default y if KERNEL_MIPS_FPU_EMULATOR
+
 config KERNEL_ARM_PMU
 	bool
 	default n