libmodprobe: remove SetMinimumLogSeverity() from constructor

Only the parent executable, not libraries should set this value.

Note that `modprobe` in toolbox and first stage init, the two primary
users of this library already set this same minimum log severity.

Test: build
Change-Id: I888968deede3323cc270efc3cfd1b40fc521d2da
diff --git a/libmodprobe/libmodprobe.cpp b/libmodprobe/libmodprobe.cpp
index bbdd317..ceabf62 100644
--- a/libmodprobe/libmodprobe.cpp
+++ b/libmodprobe/libmodprobe.cpp
@@ -336,7 +336,6 @@
     }
 
     ParseKernelCmdlineOptions();
-    android::base::SetMinimumLogSeverity(android::base::INFO);
 }
 
 void Modprobe::EnableBlocklist(bool enable) {