[PATCH 12/40] acpi: Add a table start

[Simon Glass]

It is useful to record the start of an ACPI table so that offsets from
that point can be easily calculated.

Add this to the context and set it before calling the writer method.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 drivers/core/acpi.c | 5 ++---
 include/dm/acpi.h   | 4 ++++
 2 files changed, 6 insertions(+), 3 deletions(-)

Applied to u-boot-dm, thanks!