checkpatch: add more exceptions

Add more rules to ignore, as some of them incorrectly report
false positive results, for example in [1].

[1] https://github.com/linux-msm/qdl/actions/runs/15830061230/job/44624781156?pr=37
Signed-off-by: Igor Opaniuk <igor.opaniuk@oss.qualcomm.com>

.checkpatch.conf

@@ -1,5 +1,35 @@
 --no-tree
 --strict
+--max-line-length=120
 --ignore FILE_PATH_CHANGES
 --ignore EMAIL_SUBJECT
 --ignore SPLIT_STRING
+
+# NEW_TYPEDEFS reports "do not add new typedefs"
+# typedef struct __attribute__((__packed__)) sparse_header {
+--ignore NEW_TYPEDEFS
+
+# PREFER_DEFINED_ATTRIBUTE_MACRO reports this kind of messages:
+# WARNING: Prefer __packed over __attribute__((__packed__))
+--ignore PREFER_DEFINED_ATTRIBUTE_MACRO
+
+# PREFER_KERNEL_TYPES reports this kind of messages (when using --strict):
+# "Prefer kernel type 'u32' over 'uint32_t'"
+--ignore PREFER_KERNEL_TYPES
+
+# BRACES reports this kind of messages:
+# braces {} are not necessary for any arm of this statement
+--ignore BRACES
+
+# CAMELCASE reports this kind of messages:
+# Avoid CamelCase: <xmlFreeDoc>
+--ignore CAMELCASE
+
+# AVOID_EXTERNS reports this kind of messages:
+# externs should be avoided in .c files
+# extern const char *__progname;
+--ignore AVOID_EXTERNS
+
+# COMMIT_LOG_LONG_LINE reports line lengths > 75 in commit log
+# Lets ignore this
+--ignore COMMIT_LOG_LONG_LINE