Move libc_init interface into separate component

Move libc_init interface into a separate component as it is independent
from the environment. Each libc implementation should hide its
initialization sequence in this function so SPs can remain libc
agnostic.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I8c72e2fe102ec2054b31fac50f467e9e8f8bdf94
diff --git a/components/common/libc/component.cmake b/components/common/libc/component.cmake
new file mode 100644
index 0000000..042117b
--- /dev/null
+++ b/components/common/libc/component.cmake
@@ -0,0 +1,13 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+if (NOT DEFINED TGT)
+	message(FATAL_ERROR "mandatory parameter TGT is not defined.")
+endif()
+
+target_include_directories(${TGT} PRIVATE
+	"${CMAKE_CURRENT_LIST_DIR}/include"
+)