fix(nrf54l15): give the LittleFS File shim the readBytes() Stream API

[cvaldess]

nrf54l15dk does not build on current develop.

#10920 added WaypointStore::loadFromFlash(), which reads the store header and each record through File::readBytes() (src/WaypointStore.cpp, lines 313-314 and 326). On nRF54L15, File is the Zephyr/LittleFS-backed shim in src/platform/nrf54l15/InternalFileSystem.h — a plain class rather than an Arduino Stream subclass — and it never implemented that method, so the build stops with:

src/WaypointStore.cpp:313:19: error: 'class Adafruit_LittleFS_Namespace::File' has no member named 'readBytes'
src/WaypointStore.cpp:314:19: error: 'class Adafruit_LittleFS_Namespace::File' has no member named 'readBytes'
src/WaypointStore.cpp:326:31: error: 'class Adafruit_LittleFS_Namespace::File' has no member named 'readBytes'

This adds readBytes() on top of the shim's existing read(), looping until fs_read() stops making progress. A short read is legal there, and the caller already treats a count below the requested size as end-of-file, so returning the number of bytes actually delivered matches what the Arduino Stream version does.

Verified: pio run -e nrf54l15dk goes from FAILED to SUCCESS (RAM 46.8%, flash 36.8%). The change is confined to the nRF54L15 platform shim, so no other target is affected.

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