Merge changes from topic "hm/dfs" into integration

* changes:
fix(debugfs): return negative value on error
fix(debugfs): guard against negative ch offsets

fix(debugfs): guard against negative ch offsets

The `chan` struct’s `offset` field was previously a signed long,
allowing negative values. When used in comparisons in `buf_to_channel`,
a negative of

fix(debugfs): guard against negative ch offsets

The `chan` struct’s `offset` field was previously a signed long,
allowing negative values. When used in comparisons in `buf_to_channel`,
a negative offset would be cast to a large unsigned integer, causing the
bounds check to silently fail. This could allow a negative offset to
bypass validation and lead to an out-of-bounds access during operations
like `memcpy`.

This patch changes the `offset` field to `unsigned long` and updates
affected functions to use the correct types, ensuring all offset
comparisons are safe and negative values are disallowed at the type
level.

Change-Id: I5d37bbd2fe6d7d3a19628c1a0376c3bf83947f27
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Reported-by: Bartek Piekarski <bartek.piekarski@arm.com>

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Merge "debugfs: add 9p device interface" into integration

debugfs: add 9p device interface

The 9p interface provides abstraction layers allowing the software
that uses devices to be independent from the hardware.

This patch provides a file system abstract

debugfs: add 9p device interface

The 9p interface provides abstraction layers allowing the software
that uses devices to be independent from the hardware.

This patch provides a file system abstraction to link drivers to their
devices and propose a common interface to expose driver operations to
higher layers. This file system can be used to access and configure a
device by doing read/write operations.

Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Ia9662393baf489855dc0c8f389fe4a0afbc9c255

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