linker: LoadSegments: Factor out MapSegment()

This is a preparatory patch for 16KiB app compat. No functional change
is introduced.

Bug: 339709616
Test: linker-unit-tests
Change-Id: I9ff02cd24fdf83913e55dc62f35ada904f4cb8c5
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index e865a03..c7320ae 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -68,6 +68,7 @@
   [[nodiscard]] bool ReadDynamicSection();
   [[nodiscard]] bool ReadPadSegmentNote();
   [[nodiscard]] bool ReserveAddressSpace(address_space_params* address_space);
+  [[nodiscard]] bool MapSegment(size_t seg_idx, size_t len);
   [[nodiscard]] bool LoadSegments();
   [[nodiscard]] bool FindPhdr();
   [[nodiscard]] bool FindGnuPropertySection();