syscalls: Remove references to __syscall_inline

There is no code to handle __syscall_inline so it is better removing
it from doxygen and checkpatch.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>

doc/conf.py

@@ -516,7 +516,7 @@ breathe_default_project = "Zephyr"
 # Error when parsing function declaration and more.  This is a list
 # of strings that the parser additionally should accept as
 # attributes.
-cpp_id_attributes = ['__syscall', '__syscall_inline', '__deprecated',
+cpp_id_attributes = ['__syscall', '__deprecated',
     '__may_alias', '__used', '__unused', '__weak',
     '__DEPRECATED_MACRO', 'FUNC_NORETURN']
 

doc/zephyr.doxyfile.in

@@ -1998,8 +1998,7 @@ PREDEFINED             = "CONFIG_SYS_CLOCK_EXISTS=y" \
                          "__aligned(x)=" \
                          "__printf_like(x, y)=" \
                          "__attribute__(x)=" \
-                         "__syscall=" \
-                         "__syscall_inline="
+                         "__syscall="
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The

scripts/checkpatch.pl

@@ -384,8 +384,7 @@ our $Attribute	= qr{
 			____cacheline_aligned_in_smp|
 			____cacheline_internodealigned_in_smp|
 			__weak|
-			__syscall|
-			__syscall_inline
+			__syscall
 		  }x;
 our $Modifier;
 our $Inline	= qr{inline|__always_inline|noinline|__inline|__inline__};