kbuild: frv,m32r,sparc64 introduce fake asm-offsets.h file

Needed to get them to build.
And a hint to avoid hardcoding to many constants in assembler.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/frv/kernel/asm-offsets.c b/arch/frv/kernel/asm-offsets.c
new file mode 100644
index 0000000..9e26311
--- /dev/null
+++ b/arch/frv/kernel/asm-offsets.c
@@ -0,0 +1 @@
+/* Dummy asm-offsets.c file. Required by kbuild and ready to be used - hint! */
diff --git a/arch/m32r/kernel/asm-offsets.c b/arch/m32r/kernel/asm-offsets.c
new file mode 100644
index 0000000..9e26311
--- /dev/null
+++ b/arch/m32r/kernel/asm-offsets.c
@@ -0,0 +1 @@
+/* Dummy asm-offsets.c file. Required by kbuild and ready to be used - hint! */
diff --git a/arch/sparc64/kernel/asm-offsets.c b/arch/sparc64/kernel/asm-offsets.c
new file mode 100644
index 0000000..9e26311
--- /dev/null
+++ b/arch/sparc64/kernel/asm-offsets.c
@@ -0,0 +1 @@
+/* Dummy asm-offsets.c file. Required by kbuild and ready to be used - hint! */