Explicitly set log_buf_len

By setting the log_buf_len via cmdline, devices using this cmdline will
be able to guarantee their preferred buffer size even if the underlying
CONFIG_LOG_BUF_SHIFT changes.

Bug: 185141673
Change-Id: Iafe7561dceef65fc47cb0bb54a8f84a5e10c51a9
diff --git a/BoardConfig-common.mk b/BoardConfig-common.mk
index 99fce59..99198d2 100644
--- a/BoardConfig-common.mk
+++ b/BoardConfig-common.mk
@@ -401,3 +401,6 @@
 
 # Battery options
 BOARD_KERNEL_CMDLINE += at24.write_timeout=100
+
+# Enable larger logbuf
+BOARD_KERNEL_CMDLINE += log_buf_len=1024K