Fix libpeci build

libpeci recently moved to meson.  The detection logic here wasn't
working, and would always fall back to a custom build using cmake.

Replace with a simple dependency call.

Change-Id: Ica52e81da1d8f2d0215a58aa4790c1154fa24810
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/src/meson.build b/src/meson.build
index 9f56c31..03310b7 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -61,14 +61,7 @@
 endif
 
 if get_option('intel-cpu').enabled()
-    peci_dep = meson.get_compiler('cpp').find_library('libpeci', required : false)
-    if not peci_dep.found()
-      cmake = import('cmake')
-      opt = cmake.subproject_options()
-      opt.append_compile_args('c', '-Wno-pedantic')
-      peci_proj = cmake.subproject('libpeci', options : opt)
-      peci_dep = peci_proj.dependency('peci')
-    endif
+    peci_dep = dependency('libpeci', required : true)
 endif
 
 if get_option('adc').enabled()