arm64: neon: Temporarily add a kernel_mode_begin_partial() definition

The crypto code currently relies on kernel_mode_begin_partial() being
available. Until the corresponding crypto patches are merged, define
this macro temporarily, though with different semantics as it cannot be
called in interrupt context.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/neon.h

@@ -19,4 +19,11 @@
 void kernel_neon_begin(void);
 void kernel_neon_end(void);
 
+/*
+ * Temporary macro to allow the crypto code to compile. Note that the
+ * semantics of kernel_neon_begin_partial() are now different from the
+ * original as it does not allow being called in an interrupt context.
+ */
+#define kernel_neon_begin_partial(num_regs)	kernel_neon_begin()
+
 #endif /* ! __ASM_NEON_H */